Remediation technology and process for heavy metal and organic matter composite contaminated soil

A technology for complex pollution and polluted soil, applied in the field of contaminated soil remediation, can solve problems such as poor biodegradability and secondary soil pollution, and achieve the effects of enhancing fluidity, enhancing soil fertility, and reducing content

Inactive Publication Date: 2017-05-24
BEIJING FENGZELVYUAN ENVIRONMENT TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the eluents used in the current research have certain limitations.
Utilize diethylamine tetraacetic acid sodium (Na 2 EDTA) solution is used as a leaching agent to wash heavy metal-contaminated soil, effectively remove cadmium and lead in the soil, and utilize Na 2 S·9H 2 O to precipitate heavy metals in the filtrate, making Na 2 EDTA is released again, so that the eluent can be recycled, reducing the cost of rinsing, but Na 2 EDTA has poor biodegradability and will cause secondary pollution of soil

Method used

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  • Remediation technology and process for heavy metal and organic matter composite contaminated soil

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Embodiment Construction

[0033] Enumerate 1 example below, the present invention is further described, but the present invention is not limited to this example.

[0034] Using the present invention to remediate Canadian Cu-PAHs composite polluted soil, the specific implementation is as follows:

[0035] (1) Build the washing slope: use concrete to pave a slope with a length of 100 meters and a width of 10 meters (the slope area is 1000m 2 ), the slope is 15 degrees, and 1.0-meter-high guard plates are installed on both sides of the slope;

[0036] (2) Soil spreading: use a loader to shovel, shift, and crush the soil, and the diameter of the soil block shall not be greater than 20cm. Evenly spread the contaminated soil on the slope with a thickness of 40cm;

[0037] (3) Physicochemical leaching: evenly spray 0.1moL / L eluent onto the soil surface for leaching (eluent composition: EDTA+citric acid, the concentrations of EDTA and citric acid are both 0.1mol / L, EDTA and lemon The molar ratio of the acid...

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Abstract

The invention provides a method for remediating heavy metal-organic matter composite contaminated soil. The method sequentially comprises the steps of building a leaching slope, paving the soil, carrying out heterogeneous physical and chemical leaching, backfilling, carrying out in-situ biodegradation and carrying out phytoremediation. According to the method, contaminants in the soil can be rapidly and effectively degraded, the remediation period of the contaminated soil is shortened, the remediation cost is low, no secondary contamination is caused, the method is simple and feasible, the fertility of the soil in contaminated sites can be improved, and the method is suitable for remediating the contaminated sites with various scale. The method can be used for remediating the soil contaminated by heavy metal such as Mn, Pb, As and Cu and the soil compositely contaminated by the organic matter such as petroleum and polycyclic aromatic hydrocarbon.

Description

technical field [0001] The invention belongs to the field of remediation of polluted soil, and in particular relates to a remediation technology for compound polluted soil of heavy metals and organic matter. Background technique [0002] In recent years, with the continuous advancement of my country's industrialization and urbanization, while improving people's living standards, it has also caused serious pollution to the foundation of human survival - the soil. Soil pollution includes inorganic pollution and organic pollution. Heavy metal pollution belongs to inorganic pollution, which mainly comes from the increase of heavy metal content in soil caused by human activities. It is non-degradable and highly mobile, and it takes a long time for natural purification; petroleum hydrocarbons and polycyclic aromatic hydrocarbons (PAHs ) pollution belongs to organic pollution, which mainly comes from the chemical industry, transportation, etc. Among them, PAHs are carcinogenic, te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/10B09C1/00
CPCB09C1/02B09C1/10B09C1/105
Inventor 陈键赵泉林
Owner BEIJING FENGZELVYUAN ENVIRONMENT TECH
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